9-18 Siemens Energy & Automation
SIMOREG DC Master Base Drive Panel Operating Instructions
Fault Description
No.
Cause as a function of fault value
(r047.001, r949.001 or r949.009 with acknowledged error)
Further information (r047.002 to r047.016)
25 The average armature current required for the speed range from +7% to approximately +13% of maximum speed to cover
the friction and/or steady-state load torque cannot be calculated
Possible cause:
• Drive with very little friction or very small integral-action time and, as a result of the very short measuring time,
computational inaccuracies during evaluation
• Distorted or disturbed actual speed value
• Large flywheel mass that is coupled to the drive via long shaft with high torsion, possibly via a
coupling with large amount of play
Possible remedy:
• Reduce P100 for duration of the optimization run to decrease the acceleration current applied during optimization and
thus to lengthen the measuring time
26 Load torque too high (n
set
=0% n
max
results in n
ict
≥ 40% n
max
) (actual speed value is averaged over 90 firing cycles,
speed monitoring at ≥ 40% n
max
does not start for 1s after application of speed setpoint of n
set
=0)
Possible cause:
• An excessively high load torque (in a positive or negative direction, e.g. suspended load) causes the drive to rotate (the
speed controller parameters are parameterized according to the factory setting during this run)
• One of the armature current or torque limits is parameterized too low (the motor field may not be reaching full field
strength fast enough with the result that the initial motor torque is too low)
• Maximum speed setting is incorrect
• Pulse encoder parameters are incorrect (P140 to P143)
• Parameters for tachometer adjustment are not correct (P741)
27 Load torque is too high (n
set
=0% n
max
results in |EMF| >
100% setpoint EMF) (EMF monitoring at ≥ (P101 – P100
*
P110)
does not start for 1 s after application of speed setpoint of n
set
=0)
Possible cause:
• An excessively high load torque (in a positive or negative direction, e.g. suspended load) causes the drive to rotate (the
speed controller parameters are parameterized according to the factory setting during this run)
• One of the armature current or torque limits is parameterized too low (the motor field may not be reaching full field
strength fast enough with the result that the initial motor torque is too low)
• Maximum speed setting is incorrect
• Pulse encoder parameters are incorrect (P140 to P143)
• Parameters for tachometer adjustment are not correct (P741)
• Setpoint EMF settings are incorrect (P101, P100, P110)
28 A steady-state actual speed corresponding to 0% of maximum speed cannot be reached within 0 s in speed-controlled
operation (the speed setpoint/actual value difference averaged over 90 firing cycles must be <1.0% n
max
for a total of 4s)
Possible cause: As for fault value 26
29 The calculated armature circuit inductance is greater than 327.67 mH
, therefore P111 = 327,67 mH has been set. All other
parameters (the current controller parameters P155 and P156 too) have been set correctly despite that. (For the real
armature circuit inductance in mH, see r047.i010).
Possible cause:
•e.g. field supply from the armature terminals
30 The calculated armature circuit inductance is greater than 327.67 mH
and the calculated armature circuit resistance is
greater than 32.767 Ω, therefore P111 = 327,67 mH and P110 = 32,767 Ω has been set. All other parameters have also
been set. However, the values of the current controller parameters P155 and P156 might differ from the optimum setting.
Possible cause:
•e.g. field supply from the armature terminals
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